barcode reader code in c# net Stator 2 ~ in Software

Encoder QR Code 2d barcode in Software Stator 2 ~

Stator 2 ~
Recognizing QR Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Encoding QR In None
Using Barcode creator for Software Control to generate, create Denso QR Bar Code image in Software applications.
Rotor 2
Decode QR-Code In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Draw QR In C#
Using Barcode generator for VS .NET Control to generate, create QR Code image in .NET framework applications.
Stator 1 Rotor 1
Quick Response Code Generator In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create Denso QR Bar Code image in ASP.NET applications.
Encode QR In VS .NET
Using Barcode maker for .NET framework Control to generate, create QR image in .NET applications.
Figure 182 Resolver
Painting QR-Code In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Quick Response Code image in .NET framework applications.
European Article Number 13 Creation In None
Using Barcode creation for Software Control to generate, create UPC - 13 image in Software applications.
18
Making Barcode In None
Using Barcode maker for Software Control to generate, create bar code image in Software applications.
Bar Code Encoder In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
Special-Purpose Electric Machines
UPC Code Creation In None
Using Barcode printer for Software Control to generate, create UPC-A Supplement 2 image in Software applications.
Printing Data Matrix ECC200 In None
Using Barcode generator for Software Control to generate, create Data Matrix ECC200 image in Software applications.
recall that such encoders provide a digital signal directly related to the position of a rotating shaft Their output can therefore be directly used to drive the current supply for a brushless motor To understand the operation of the brushless DC motor, it will be useful to make an analogy with the operation of a permanent-magnet (PM) DC motor As discussed in 17, in a permanent-magnet DC motor, a xed magnetic eld generated by the permanent magnets interacts with the perpendicular eld induced by the currents in the rotor windings, thus creating a mechanical torque As the rotor turns in response to this torque, however, the angle between the stator and rotor elds is reduced, so that the torque would be nulli ed within a rotation of 90 electrical degrees To sustain the torque acting on the rotor, permanent-magnet DC motors incorporate a commutator, xed to the rotor shaft The commutator switches the supply current to the stator so as to maintain a constant angle, = 90 , between interacting elds Because the current is continually switched between windings as the rotor turns, the current in each stator winding is actually alternating, at a frequency proportional to the number of motor magnetic poles and the speed The basic principle of operation of the brushless DC motor is essentially the same, with the important difference that the supply current switching takes place electronically, instead of mechanically Figure 183 depicts a transistor switching circuit capable of switching a DC supply so as to provide the appropriate currents to a three-phase rotor winding The electronic switching device consists of a rotor position sensor, xed on the motor shaft, and an electronic switching module that can supply each stator winding Diagrams of the phase-to-phase back emf s and the switching sequence of the inverter are shown in Figure 184 The back emf waveforms shown in Figure 184 are called trapezoidal; the total back emf of the inverter is obtained by piecewise addition of the motor phase voltages and is a constant voltage, proportional to motor speed You should visually verify that the addition of the three phase voltages of Figure 184 leads to a constant voltage The brushless DC motor is therefore similar to a standard permanent-magnet DC motor, and can be described by the following simpli ed equations: V = ka m + Rw I T = kT I where ka = kT and where V = motor voltage ka = armature constant m = mechanical speed Rw = winding resistance T = motor torque kT = torque constant I = motor (armature) current The speed and torque of a brushless DC motor can therefore be controlled with any variable-speed DC supply, such as one of the supplies brie y discussed in (181) (182)
Drawing EAN8 In None
Using Barcode printer for Software Control to generate, create EAN-8 Supplement 5 Add-On image in Software applications.
Data Matrix 2d Barcode Creator In Java
Using Barcode generator for Java Control to generate, create Data Matrix ECC200 image in Java applications.
Part III
Scanning UPC-A In Visual Studio .NET
Using Barcode decoder for .NET Control to read, scan read, scan image in VS .NET applications.
Matrix 2D Barcode Generator In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Matrix Barcode image in ASP.NET applications.
Electromechanics
UPC-A Supplement 5 Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Generate EAN-13 In Java
Using Barcode printer for Android Control to generate, create UPC - 13 image in Android applications.
a T1
EAN13 Creation In Java
Using Barcode creation for Java Control to generate, create EAN13 image in Java applications.
Generating Code 3 Of 9 In C#
Using Barcode creation for .NET framework Control to generate, create Code 3/9 image in .NET framework applications.
T3 a' c'
Variable DC supply T4 T5 T6 b c
b' Stator
Transistor supply for brushless DC motor a S1
S3 a' c'
Variable DC supply S4 S5 S6 b c
b' Stator
SCR supply for brushless DC motor
Figure 183 Transistor and SCR drives for a brushless DC motor
1 = Transistor on 0 = Transistor off Phase-to-phase stator voltage V a-b T1 T2 T3 V b-c T4 V c-a T5 T6 60 120 180 240 300 360 60 120 180 Electrical degrees 60 120 180 240 300 360 60 120 180 Electrical degrees 1 0 1 0 1 0 1 0 1 0 1 0
Figure 184 Phase voltages and transistor (SCR) switching sequence for the brushless DC motor drive of Figure 183
11 Further, since the brushless motor has intrinsically higher torque and lower inertia than its DC counterpart, its response speed is superior to that obtained from traditional DC motors Figure 185 depicts the torque-speed (a) and ef ciency (b) curves of a commercially produced brushless DC motor One important difference between the conventional DC and the brushless motor, however, is due to the coarseness of the electronic switching compared with the mechanical switching of the brush-type DC motor (recall the discussion of torque ripple due to the commutation effect in DC motors in 17) In practice, one cannot obtain the exact trapezoidal emf of Figure 184 by means of the transistor switching circuit of Figure 183, and a voltage ripple results as a consequence, leading to a torque ripple in the motor Additional phase windings on the stator could solve the problem, at the expense of further complexity in the
Copyright © OnBarcode.com . All rights reserved.